Direct modulation and mode locking of 1.3 μm quantum dot lasers

M. Kuntz, G. Fiol, M. Lämmlin, D. Bimberg, M. G. Thompson, K. T. Tan, C. Marinelli, A. Wonfor, R. Sellin, R. V. Penty, I. H. White, V. M. Ustinov, A. E. Zhukov, Yu M. Shernyakov, A. R. Kovsh, N. N. Ledentsov, C. Schubert, V. Marembert

Research output: Contribution to journalArticlepeer-review

54 Citations (SciVal)


We report 7 GHz cut-off frequency, 2.5 and 5 Gb s-1 eye pattern measurements upon direct modulation of 1.3 μm quantum dot lasers grown without incorporating phosphorus in the layers. Passive mode-locking is achieved from very low frequencies up to 50 GHz and hybrid mode-locking is achieved up to 20 GHz. The minimum pulse width of the Fourier-limited pulses at 50 GHz is 3 ps, with an uncorrelated timing jitter below 1 ps. The lasers are optimized for high frequency operation by a ridge waveguide design that includes etching through the active layer and ridge widths down to 1 μm. The far-field shape for 1 μm is close to circular with a remaining asymmetry of 1.2.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalNew Journal of Physics
Publication statusPublished - 26 Nov 2004

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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